[diagso]

Using ISTA you cannot select individual ECU or code only without programming. It usually updates the whole car. Its likely the vehicle was updated using ISTA or esys was used to code and change i-level

You can actually - you can select individual ecus under the advanced tab and choose programming and/or encoding

Exactly. I see the same crap over and over that you can't change these. If you haven't even tried to do that then at least read release notes. They frequently state "Assign HU-H3 control unit manually for programming in ISTA" or similar. How you are supposed to do that if ISTA+ would not allow you to???

Well at least ISTA+ official can't unselect any units who are selected by calculation of messuring plan. I know it's possible in ISTAP expert version but DME will always be affected as well even if not selected. No offense, maybe you know more than I do please tell me how to do singel unit coding in ISTA offline? I havent tried with the one from sedoy might be different though

I don't know about ISTA+ official, but ISTA+ from Sedoy DEFINITELY ALLOWS EXACTLY THAT. I would expect official one to allow that too, based on release notes. And that was possible for years now. I remember it was not possible VERY long ago, but was possible for years now.

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IMHO BMW just plays it safe here. Some new iLevels are different in coding only in relation to previous level. So it writes a new level to a car anyway.

In any case as far as I understand this is just for information ONLY. So older ISTA version can tell you that a vehicle was processed with newer one. When doing actual calculations all softwares (ESys, ISTA-P, ISTA+, etc) uses actual unit data, not this iLevel.

That was my concern. If it is like that than one should not decide weather a vehicle should be programmed or not by comparing vehicle I-Level and actual ISTA I-Level and concluding that it is up to date. In any case one should start the process for actual calculation and see the outcome.

I will try this with both ISTA+ and ISTA/P and report back.

As I already said both of these actually perform calculations to offer unit upgrades if/when needed. And as bmchicago confirms this in an actual procedure at BMW.

That got me curious. 

For ISTA P expert mode allows to deselect ECU's no problem.

For Sedoys ISTA+ in config file I can see that all expert options are "true" nevertheless when I go to updated->advance tab some modules are greyed out and there's no possibility to deselect them. Reading your comments I assume that's somethign wrong here?

Just for clarity sake, I can add more ECU's or code replaced ones but for ISTA+ act's like ISTA P in standard mode no matter what I do.